order by key array multidimensional

Question

我有這個多維數組，我想用'fecha'命令每個數組（我的意思是2017-02-20，然後是2017-02-21，然後是2017-02-22，最後是2017 -02-23）。我已經閱讀了很多答案，但它們只能用於二維數組。我嘗試過使用unsort和array_multisort，即使使用kso​​rt bue我也無法獲得期望的結果。

Array 
    (
     [0.10] => Array 
      (
       [0] => Array 
        (
         [fecha] => 2017-02-21 
         [tarifa] => 743.80 
         [percent] => 0.10 
        ) 

       [1] => Array 
        (
         [fecha] => 2017-02-22 
         [tarifa] => 743.80 
         [percent] => 0.10 
        ) 

       [2] => Array 
        (
         [fecha] => 2017-02-20 
         [tarifa] => 743.80 
         [percent] => 0 
        ) 

       [3] => Array 
        (
         [fecha] => 2017-02-23 
         [tarifa] => 743.80 
         [percent] => 0 
        ) 

      ) 

     [0.15] => Array 
      (
       [0] => Array 
        (
         [fecha] => 2017-02-21 
         [tarifa] => 743.80 
         [percent] => 0.15 
        ) 

       [1] => Array 
        (
         [fecha] => 2017-02-22 
         [tarifa] => 743.80 
         [percent] => 0.15 
        ) 

       [2] => Array 
        (
         [fecha] => 2017-02-20 
         [tarifa] => 743.80 
         [percent] => 0 
        ) 

       [3] => Array 
        (
         [fecha] => 2017-02-23 
         [tarifa] => 743.80 
         [percent] => 0 
        ) 

      ) 

    ) 

Answer 1

可以使用usort與strtotime按日期排序。按日期（日期星）

ASC秩序：日期（日期星）

foreach ($yourArray as $key => $subarray) { 
    usort($subarray, function($a, $b) { 
      return strtotime($a['fecha']) - strtotime($b['fecha']); 
     }); 
    $yourArray[$key] = $subarray; 
} 

print_r($yourArray); 

DESC順序：

foreach ($yourArray as $key => $subarray) { 
    usort($subarray, function($a, $b) { 
      return strtotime($b['fecha']) - strtotime($a['fecha']); 
     }); 
    $yourArray[$key] = $subarray; 
} 

print_r($yourArray); 

Answer 2

嘗試：

foreach ($yourArray as $key => &$subarray) { 
     usort($subarray, function($a, $b) { 
      return $a['fecha'] <= $b['fecha']; 
     }); 
    } 
    print_r($yourArray); //now it's sorted